Ultrasonic Messenger
Nickname
Device UUID
New
Transmits UUID without hyphens for compactness.
Security
Shared passphrase
Used to derive an AES-GCM session key. Keep it short but the same on both devices.
Derive key
no key
Transmit
Near ultrasonic FSK:
19.5 kHz = 0
20.5 kHz = preamble
21.5 kHz = 1
Symbol ms
Repeats
Send beacon
Stop
Message to send
Send encrypted message
Limit ~60 chars
Receive
Start listening
Stop
Grant mic permission. Use 48 kHz devices for better results.
Heard devices
Inbox
Log